Egwene mentions a herb garden in the balcony, with basil, thyme and a bunch of other herbs. Now, those were stupid choices of herbs to mention, I'll give you that, but it is even stupider to ignore that there are other herbs growing.

And the vegetables are growing inside.

As for Egwene's comment on Nynaeve, it shows that she has her friend in mind, is aware of her likes and dislikes, and wishes she could meet with another who seemed to view Healing in a similar manner.

And Suana's invitation to Egwene... yes you need to have some ability with Healing, but wanting to Heal is more important. Look at Moiraine, who is a superb Healer, but doesn't want to spend her life Healing.

As Egwene says, she doesn't shine at Healing, but that doesn't mean she's useless at it. She could be an average Healer, but since for Egwene, average ability is nothing to be proud of, she constantly downgrades herself.